<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css选择器</title>
    <style>
        div{
            background-color: pink;
        }
        #id1{
            color: cadetblue;
            font-size: 60px;
        }
        #id2 {
            color: coral;
            font-size: 80px;
        }
        .cla{
            color: crimson;
        }
    </style>
</head>
<body>
<div>
    div元素选择器<br>
    <h3 id="id1">单独的id选择器</h3>
    <h3 id="id2">单独的id选择器</h3>
    <h3 class="cla">统一的class选择器</h3>
    <h3 class="cla">统一的class选择器</h3>
    <h3 class="cla">统一的class选择器</h3>
</div>

</body>
</html>